In a bowl, sift the flour and baking powder together. Add the sugar, vanilla extract, and the cappuccino mix. Stir well.
Pour in the milk and oil, beat in the eggs, and mix until smooth.
Grease a muffin tin, pour in the batter, and bake for 20-25 minutes.
Meanwhile, prepare the frosting: Beat the heavy cream with cornstarch, sugar, vanilla extract, and cappuccino mix until stiff. Once ready, frost the cooled cupcakes.